Errata With The Mx480 Router Documentation - Juniper MX480 Hardware Manual

Errata with the MX480 Router Documentation

This topic lists outstanding documentation issues:
The shut-down voltage and start-up voltages as stated in the following note in the MX480 hardware
guides and MX480 Quick Start are not correct under all circumstances: [PR/273771]
NOTE: If the input voltage from the DC power source drops below –36.5 to –38.5 VDC,
the router automatically shuts down. During automatic shutdown, the circuit remains active.
When the input voltage returns to –40.0 to –41.0 VDC, the router automatically starts up
again and the system returns to normal operation within 30 minutes. No operator intervention
is required.
For the cooling system to function properly, the airflow around the chassis must be unrestricted. Allow
at least 8 in. (20.3 cm) of clearance between side-cooled routers. Allow 5.5 in. (14 cm) between the side
of the chassis and any non-heat-producing surface such as a wall. [PR/258887]
When installing the router without a mechanical lift, remove and reinstall components from the chassis,
first from the rear and then from the front. Components should be removed and reinstalled in the
following order: power supplies, fan tray, SCBs, and DPCs.[PR/265034]
Replace the air filter, located at the left rear of the router, every 6 months for optimum cooling system
performance.
Two threaded inserts (PEM nuts) are provided on the upper rear of the chassis for connecting the router
to earth ground. The grounding points fit UNC 1/4–20 screws (American).
The mounting shelf should be installed on the back of the rail as described in the MX480 Universal Routing
Platform Hardware Guide.
After installing a DC power cable or AC power cord, route the power cable or power cord along the
cable restraint towards the left or right corner of the chassis. If needed, thread plastic cable ties, which
you must provide, through the openings on the cable restraint to hold the power cord or cables in place.
Table 7 on page 39 describes the functions of the host subsystem OFFLINE LED.
Table 17: Host Subsystem OFFLINE LED
Label Color
OFFLINE Red
State Description
On Host is installed but the Routing Engine is offline.
steadily
Off Host is not installed.
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